Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 85% on time.

Nonstops (seasonal or thin)


Delta	SEA	CVG	4h 24m	89%	0.8%	362	Flying now
Alaska	SEA	CVG	4h 25m	82%	0.9%	431	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Hebron on time. Total trip = scheduled departure to arrival, layover included (Hebron is 3 h ahead of Seattle). Layovers up to 4 hours. Pick a connection for the details.


American Details →	SEA 20:45 → MIA 05:37AA 1471	3h 04m Miami	MIA 08:41 → CVG 11:34 +1AA 4121 · flown by Envoy	11h 49m	98%	93%
Delta Details →	SEA 16:20 → LAS 18:57DL 2955	3h 17m Las Vegas	LAS 22:14 → CVG 05:00 +1DL 2794	9h 40m	100%	90%
Delta Details →	SEA 05:30 → SLC 08:30DL 1128	1h 10m Salt Lake City	SLC 09:40 → CVG 15:08DL 2273	6h 38m	96%	87%
Delta Details →	SEA 23:59 → MSP 05:17DL 953	1h 57m Minneapolis	MSP 07:14 → CVG 10:02 +1DL 954	7h 03m	99%	87%
United Details →	SEA 05:00 → DEN 08:43UA 2601	57m Denver	DEN 09:40 → CVG 14:27UA 1978	6h 27m	95%	87%
American Details →	SEA 23:56 → ORD 06:02AA 2881	1h 04m Chicago	ORD 07:06 → CVG 09:35 +1AA 3489 · flown by Envoy	6h 39m	94%	87%
Delta Details →	SEA 11:05 → SLC 14:11DL 1265	3h 14m Salt Lake City	SLC 17:25 → CVG 22:50DL 2291	8h 45m	99%	86%
Delta Details →	SEA 22:58 → ATL 06:45DL 409	3h 14m Atlanta	ATL 09:59 → CVG 11:25 +1DL 3160	9h 28m	100%	86%
Tight connection: often missed
American Details →	SEA 13:58 → ORD 20:26AA 2520	1h 34m Chicago	ORD 22:00 → CVG 00:30 +1AA 4776 · flown by Republic	7h 32m	74%	50%
Delta Details →	SEA 11:15 → BOS 19:43DL 438	1h 02m Boston	BOS 20:45 → CVG 23:16DL 5801 · flown by Republic	9h 01m	65%	42%
Southwest Details →	SEA 11:45 → MDW 18:00WN 3081	55m Chicago	MDW 18:55 → CVG 21:08WN 2756	6h 22m	49%	24%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

SLC · 1h 10m · leaves 05:30 4%

DEN · 57m · leaves 05:00 5%

ORD · 1h 04m · leaves 23:56 6%

Afternoon and evening

BOS · 1h 02m · leaves 11:15 35%

ORD · 54m · leaves 10:52 39%

MDW · 55m · leaves 11:45 51%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Alaska AS 1456 SEA 16:19 → LAS Delta DL 2794 LAS 22:14 → CVG Connection details →	3h 20m	9h 41m	98%	89%
Alaska AS 394 SEA 21:33 → MCO Southwest WN 1249 MCO 08:30 → CVG Connection details →	2h 14m	10h 07m	96%	88%
Alaska AS 22 SEA 23:15 → JFK American AA 4609 JFK 11:10 → CVG Connection details →	3h 32m	11h 09m	100%	85%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON